/**
 * Created by jiachenpan on 16/11/18.
 */

export function parseTime(time, cFormat) {
	if(arguments.length === 0) {
		return null
	}
	const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
	let date
	if(typeof time === 'object') {
		date = time
	} else {
		if(('' + time).length === 10) time = parseInt(time) * 1000
		date = new Date(time)
	}
	const formatObj = {
		y: date.getFullYear(),
		m: date.getMonth() + 1,
		d: date.getDate(),
		h: date.getHours(),
		i: date.getMinutes(),
		s: date.getSeconds(),
		a: date.getDay()
	}
	const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
		let value = formatObj[key]
		// Note: getDay() returns 0 on Sunday
		if(key === 'a') {
			return ['日', '一', '二', '三', '四', '五', '六'][value]
		}
		if(result.length > 0 && value < 10) {
			value = '0' + value
		}
		return value || 0
	})
	return time_str
}

export function formatTime(time, option) {
	time = +time * 1000
	const d = new Date(time)
	const now = Date.now()

	const diff = (now - d) / 1000

	if(diff < 30) {
		return '刚刚'
	} else if(diff < 3600) {
		// less 1 hour
		return Math.ceil(diff / 60) + '分钟前'
	} else if(diff < 3600 * 24) {
		return Math.ceil(diff / 3600) + '小时前'
	} else if(diff < 3600 * 24 * 2) {
		return '1天前'
	}
	if(option) {
		return parseTime(time, option)
	} else {
		return(
			d.getMonth() +
			1 +
			'月' +
			d.getDate() +
			'日' +
			d.getHours() +
			'时' +
			d.getMinutes() +
			'分'
		)
	}
}
export function debounce(func, wait, immediate) {
	let timeout, args, context, timestamp, result

	const later = function() {
		// 据上一次触发时间间隔
		const last = +new Date() - timestamp

		// 上次被包装函数被调用时间间隔last小于设定时间间隔wait
		if(last < wait && last > 0) {
			timeout = setTimeout(later, wait - last)
		} else {
			timeout = null
			// 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
			if(!immediate) {
				result = func.apply(context, args)
				if(!timeout) context = args = null
			}
		}
	}

	return function(...args) {
		context = this
		timestamp = +new Date()
		const callNow = immediate && !timeout
		// 如果延时不存在，重新设定延时
		if(!timeout) timeout = setTimeout(later, wait)
		if(callNow) {
			result = func.apply(context, args)
			context = args = null
		}

		return result
	}
}
export function isExternal(path) {
	return /^(https?:|mailto:|tel:)/.test(path)
}